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Derivative Financial Instruments - Effect of Derivative Instruments on Consolidated Statement of Earnings (Detail) (Derivatives not designated as hedging instruments [Member], USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Derivatives, Fair Value [Line Items]      
Amount of Gain Recognized in Income on Derivative Instruments $ 133us-gaap_DerivativeGainOnDerivative $ 0us-gaap_DerivativeGainOnDerivative $ 1,252us-gaap_DerivativeGainOnDerivative
Interest rate swaps [Member] | Other Income [Member]
      
Derivatives, Fair Value [Line Items]      
Amount of Gain Recognized in Income on Derivative Instruments $ 133us-gaap_DerivativeGainOnDerivative
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_OtherIncomeMember		 $ 0us-gaap_DerivativeGainOnDerivative
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_OtherIncomeMember		 $ 1,252us-gaap_DerivativeGainOnDerivative
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_OtherIncomeMember